<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>

  <div id="app">
    <button v-on:click="dolt">点击1</button>
    <button @click="dolt">点击2</button>
    <button @dblclick="dolt">双击点击</button>
    <h2 @click="changeFood">{{food}}</h2>
    <div>
      <!-- 开发环境版本，包含了有帮助的命令行警告 -->
      <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
      <script>
        var app = new Vue({
          el: "#app",
          data: { 
            food:"eat hotpot"
          },
          methods: {
            dolt: function () {
              console.log('lisa');
            },
            changeFood: function () {
             // console.log(this.food);
this.food+=" yumyumyum"
            }
          }
        })
      </script>
</body>

</html>